refactor: move encoding/decoding functions to encodor class (#111)

* refactor: move encoding functions to class

* test: update tests for new Encodor class

* chore: update README.rst

* chore: update configuration documentation

* fix: defaults no longer coming from config files

* refactor: move strip_docstring to Formator class

* test: move strip_docstring tests to format_docstring test file

README.rst

@@ -58,9 +58,12 @@ Features
   whitespace. Such trailing whitespace is visually indistinguishable
   and some editors (or more recently, reindent.py) will trim them.
 
-See the the full documentation at `read-the-docs`_.
+See the the full documentation at `read-the-docs`_, especially the
+`requirements`_ section for a more detailed discussion of PEP 257 and other
+requirements.
 
 .. _read-the-docs: https://docformatter.readthedocs.io
+.. _requirements: https://docformatter.readthedocs.io/en/latest/requirements.html
 
 Installation
 ============